21201022001001 has 8 divisors (see below), whose sum is σ = 28268073000864. Its totient is φ = 14133992834240.

The previous prime is 21201022000999. The next prime is 21201022001039. The reversal of 21201022001001 is 10010022010212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201022001001 - 2¹ = 21201022000999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201022001041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3039351 + ... + 7186076.

It is an arithmetic number, because the mean of its divisors is an integer number (3533509125108).

Almost surely, 2^{21201022001001} is an apocalyptic number.

It is an amenable number.

21201022001001 is a deficient number, since it is larger than the sum of its proper divisors (7067050999863).

21201022001001 is a wasteful number, since it uses less digits than its factorization.

21201022001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916551.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21201022001001 its reverse (10010022010212), we get a palindrome (31211044011213).

The spelling of 21201022001001 in words is "twenty-one trillion, two hundred one billion, twenty-two million, one thousand, one".